code: def setUpClass(cls):
      super().setUpClass()
      np.random.seed(42)
  
imports: import numpy
  import pandas
  from nfoursid import kalman, state_space
  from sklearn.gaussian_process.kernels import RBF, ExpSineSquared
  from darts import TimeSeries
  from darts.metrics import rmse
  from darts.models.filtering.gaussian_process_filter import GaussianProcessFilter
  from darts.models.filtering.kalman_filter import KalmanFilter
  from darts.models.filtering.moving_average_filter import MovingAverageFilter
  from darts.utils import timeseries_generation
label_desc: Use image node_id 1 for calling the FilterBaseTestClass obj's underlying member method code with example usage: obj.setUpClass(cls) without return types